I apologize if this has been answered before, but I looked around and could not find anything on it. I happened to come across Community's profile today, and it turns out that it has an active bounty, with 4 days remaining. How is this possible? The only thing I can think of is from Community's profile description:
Randomly poke old unanswered questions every hour so they get some attention.
Does this include adding bounties? If so, what is the criteria for getting a question awarded a community bounty? The only other thing I can think of is that these bounties are from users who had their accounts deleted; is this the case?
For future reference, here is a screenshot of the active bounty: